Finding schema differences

Written by on Wednesday, February 27, 2008 4:09 - 0 Comments

How to find schema differences between two forests.

Here’s an interesting issue one consultant told me about. He had heard that a company wanted to migrate some user and computer accounts from one Active Directory forest to another forest. So far so good, right? But the original (first) forest had had some modifications made to its AD schema to extend the schema in order to support several third-party applications, and unfortunately the documentation on what modifications had been made to the schema were…let’s say…sorely lacking.

The company wanted to know if there was some way of finding out what differences there were between the schema of the original forest and the schema of the new forest. After some searching around, the consultant came up with Schema Analyzer, a tool included with ADAM (Active Directory in Application Mode) and using this tool the company could compare the two schemas and determine which classes and attributes were present in the original schema that were not present in the new schema. Then the company could use this information to create the necessary classes and attributes in the new schema.

For more information about Schema Analyzer and ADAM, see Introducing ADAM.

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